{"id":181809,"date":"2026-05-30T14:48:10","date_gmt":"2026-05-30T12:48:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils"},"modified":"2026-05-30T14:48:10","modified_gmt":"2026-05-30T12:48:10","slug":"obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","title":{"rendered":"Objavljena je LPE ranjivost CIFSwitch u Linux CIFS\/cifs-utils","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Stru\u010dnjak za sigurnost <strong>Asim Manizada<\/strong> otkrio ranjivost <strong>CIFSwitch<\/strong> \u2014 lokalno podizanje privilegija u kombinaciji s Linux jezgrom i korisni\u010dkim paketom <strong>cifs-utils<\/strong>. Problem se odnosi na putanju obrade <strong>CIFS\/SMB Kerberos\/SPNEGO upcall<\/strong>, \u0161to je mehanizam kroz koji CIFS klijent jezgre tra\u017ei od korisni\u010dkog helpera podatke za Kerberos autentifikaciju prilikom montiranja SMB resursa. Opis je objavljen nakon isteka embarga linux-distros; identifikator CVE u trenutku objave jo\u0161 nije bio dodeljen.<\/p>\n<p><noindex><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">Bit ranjivosti je u tome<\/a>, da nepprivilegirani korisnik mo\u017ee pozvati request_key(&quot;cifs.spnego&quot;, &#8230;) i proslijediti la\u017eni opis klju\u010da. U normalnom scenariju, takav redak trebao bi formirati sam CIFS-klijent jezgre: sadr\u017ei informacije o poslu\u017eitelju, UID, credential UID, PID, cilju upcalla i drugim parametrima. Me\u0111utim, jezgra nije provjeravala da li opis zaista dolazi iz CIFS-podsustava, a cifs.upcall, pokretan od roota putem standardnog pravila request-key, je povjeravao ovim poljima kao podacima koje je stvorila jezgra.<\/p>\n<p><\/noindex><\/noindex><\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2026\/05\/28\/2\">Ranjivost nije univerzalna<\/a> \u00abrupa u bilo kojem Linux-u out-of-the-box\u00bb. Za eksploataciju nekoliko uslova mora biti ispunjeno: prisustvo ranjive jezgre, instaliran cifs-utils s pravilom cifs.spnego, mogu\u0107nost neprivilegiranih korisnika da kreiraju user\/mount namespaces, kao i odsustvo blokada od strane SELinux-a, AppArmor-a ili druge LSM politike. U obave\u0161tenju na oss-security posebno je navedeno da na ranjivim sistemima to omogu\u0107ava put od neprivilegiranog lokalnog korisnika do izvr\u0161avanja koda kao root.<\/p>\n<p><\/noindex><br \/>\n<noindex><\/p>\n<p>Tehni\u010dki <a rel=\"nofollow\" href=\"https:\/\/blog.cloudlinux.com\/cifswitch-mitigation-and-kernel-update\">lanac se gradi oko toga<\/a>, da cifs.upcall mo\u017ee pre\u0107i u imenske prostore navedene u la\u017enom opisu, i izvr\u0161iti NSS upit pre kona\u010dnog brisanja privilegija. Kao rezultat, okru\u017eenje koje kontroli\u0161e napada\u010d mo\u017ee uticati na u\u010ditavanje NSS modula od strane root procesa. U javnim opisima se nagla\u0161ava da je ovo logi\u010dka gre\u0161ka na granici jezgre i korisni\u010dkog prostora, a ne klasi\u010dna ranjivost korupcije memorije.<\/p>\n<p><\/noindex><\/p>\n<p>Ispravka u jezgri se pokazala malom obimom: za tipove klju\u010deva cifs.spnego dodana je provala koja odbacuje opise koji nisu stvoreni od strane samog CIFS klijenta s njegovim privatnim spnego_cred. Ovaj pristup zatvara klasu napada bez obaveznog sinkroniziranja promjena u cifs-utils, iako autor napominje da je dodatno poja\u010danje korisni\u010dkog prostora jo\u0161 uvek po\u017eeljno.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">AlmaLinux je obavestio<\/a>, da je osnovna logika prisutna u svim podr\u017eanim izdanjima AlmaLinux-a, a AlmaLinux 8, 9, 10 i Kitten 10 se smatraju zahva\u0107enima ako je cifs-utils instaliran. Ispravljena jezgra su pripremljena u testing-repozitorijima: za AlmaLinux 9 je ozna\u010den paket kernel-5.14.0-687.5.4.el9_8 ili noviji, za AlmaLinux 10 \u2014 kernel-6.12.0-211.7.4.el10_2 ili noviji.<\/p>\n<p><\/noindex><\/p>\n<p>Kao privremena mjera do instalacije ispravljenog kernela preporu\u010duje se uklanjanje cifs-utils, ako SMB\/CIFS-klijent na sustavu nije u upotrebi, zabraniti u\u010ditavanje cifs modula, prebrisati pravilo cifs.spnego u request-key ili isklju\u010diti neprivilegirane user namespaces. Ove zaobila\u017eenja mogu pokvariti Kerberos-autentifikaciju za CIFS-monta\u017ee, stoga ih treba primjenjivati oprezno na serverima gdje se stvarno koriste Kerberos-authenticated SMB-\u0161erpe.<\/p>\n<p>CIFSwitch je zanimljiv i kontekstom otkrivanja: autor je opisuje kao rezultat pretrage vi\u0161estepene lance koriste\u0107i LLM i grafi\u010dko predstavljanje veza izme\u0111u objekata sigurnosti. No, prakti\u010dan zaklju\u010dak za administratore je sasvim pragmati\u010dan: provjeriti prisutnost cifs-utils, stanje user namespaces i a\u017euriranja kernela, posebno na sustavima gdje postoje lokalni korisnici ili skripte kontejnera s pro\u0161irenim mogu\u0107nostima namespaces.<\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/security\/18305995\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0432\u044f\u0437\u043a\u0435 \u044f\u0434\u0440\u0430 Linux \u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 cifs-utils. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043f\u0443\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 CIFS\/SMB Kerberos\/SPNEGO upcall, \u0442\u043e \u0435\u0441\u0442\u044c \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c, \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 CIFS-\u043a\u043b\u0438\u0435\u043d\u0442 \u044f\u0434\u0440\u0430 \u0437\u0430\u043f\u0440\u0430\u0448\u0438\u0432\u0430\u0435\u0442 \u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e helper\u2019\u0430 \u0434\u0430\u043d\u043d\u044b\u0435 \u0434\u043b\u044f Kerberos-\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u043f\u0440\u0438 \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 SMB-\u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043e \u043f\u043e\u0441\u043b\u0435 \u0438\u0441\u0442\u0435\u0447\u0435\u043d\u0438\u044f \u044d\u043c\u0431\u0430\u0440\u0433\u043e linux-distros; \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 CVE \u043d\u0430 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0435\u0449\u0451 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181809","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 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